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  • Hi Ra

    In you second-last post I assume you meant -
    "You can clearly see that the glass based TIR at the LEFT side of the pic is much more transparent than the acrylic one at the right, "

    Keep up the great work. I started building my first telesope in 1963, but I'm still learning much about torch optics from your posts.

    I'm currently building a focusable SST50 headlamp and will start posting when I have some photos.

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